Product Description
Fix CP4.2 weak links without converting to CP3. The Exergy E04 10504 Improved Stock CP4.2 pump is a direct-fit replacement for 2011–2016 GM Duramax 6.6L LML trucks, engineered by Exergy to improve internal robustness and deliver stable rail pressure with OE-like drivability.
Key Benefits
- Improved-stock CP4.2 design to address known wear/failure points
- Flow-verified and calibrated by Exergy for repeatable performance
- Direct bolt-in for LML (no conversion kit required)
- Maintains factory emissions equipment and drivability
Fitment
- Make/Model: Chevrolet Silverado 2500HD/3500HD; GMC Sierra 2500HD/3500HD
- Engine: 6.6L Duramax LML
- Years: 2011, 2012, 2013, 2014, 2015, 2016
What’s Included
- Exergy E04 10504 Improved Stock CP4.2 Pump (for LML)
- Pre-calibrated metering unit; factory-style connections
- Basic installation guidance
Recommended Supporting Parts
Protect your investment with clean, consistent supply and Exergy-brand fueling upgrades:
- GM Duramax Lift Pumps
- Exergy LML Injector Sets (choose flow to match goals):
- Duramax Gaskets & Seals
- Shop All Exergy Performance
Install Notes
- Professional installation recommended. Prime/bleed system thoroughly after install.
- No tuning required for stock fueling. Calibrate if pairing with higher-flow Exergy injectors.
- Use high-quality filtration and fresh fuel; contamination is the #1 cause of pump failure.
Frequently Asked Questions
Q: Why choose an improved-stock CP4.2 over a CP3 conversion?
A: It keeps factory emissions hardware and drivability while addressing internal durability. It’s a direct bolt-in with fewer parts than a conversion.
Q: Do I need a lift pump with this?
A: Strongly recommended for supply stability, filtration, and pump life. See our Duramax lift pumps.
Q: Is there a core charge?
A: If applicable, you’ll see core details at checkout or in the product options.
Q: Warranty?
A: Covered by Exergy’s manufacturer warranty. Keep proof of purchase and follow proper install/filtration practices.
About Exergy Performance
Exergy is a leader in precision diesel fuel system components. Explore the full lineup here: Exergy Performance at CPP Diesel.
